RADIOCARBON DATED WOOD DEBRIS IN FLOODPLAIN DEPOSITS OF THE SAN RIVER IN THE BIESZCZADY MOUNTAINS

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1 GEOCHRONOMETRIA Vol. 21, pp , 2002 Journal on Methods and Applications of Absolute Chronology RADIOCARBON DATED WOOD DEBRIS IN FLOODPLAIN DEPOSITS OF THE SAN RIVER IN THE BIESZCZADY MOUNTAINS JÓZEF KUKULAK 1, ANNA PAZDUR² and TADEUSZ KUC 3 1 Department of Geography, Pedagogical University, Podchor¹ ych 2, Cracow, Poland ( ²Department of Radioisotopes, Institute of Physics, Silesian University of Technology, Krzywoustego 2, Gliwice, Poland ( 3 Department of Physics and Nuclear Techniques, University of Mining and Metallurgy, Al. Mickiewicza 30, Cracow, Poland ( Key ey words: WOOD DEBRIS, ALLUVIUM, RADIOCARBON DATING, HOLOCENE, CARPATHIANS Abstract: Tree logs and smaller fragments of wood debris occur in floodplain alluvium (1-3 m above the river level) of the San river in the Bieszczady Mountains (Polish East Carpathians). The greatest accumulations of wood debris occur in the lower part of the alluvium, beneath a layer of sandy muds. The wood debris in these accumulations was dated by radiocarbon method. The dates fall within the time interval 3270±70 BP to 103.7±1.1 pmc, but most of them are from 17 th to 19 th century. The abundance of the wood debris in the alluvium is the result of its intense supply to the river channel, caused by deforestation and large floods. The age of the wood accumulations corresponds to the phase of settlement in the upper San valley in the 16 th to 17 th centuries. The older wood debris could be redeposited to the young alluvium from older alluvial terraces. 1. INTRODUCTION Wood debris is usually a subordinate component in alluvial sediments and it usually widely varies in size. Large buried logs and other coarse wood fragments (branches, roots) usually focus the attention of researchers. Less visible is fine debris (leaves, bark, fruits and seeds) and this is usually omitted in descriptions of alluvial sediments. Dating of wood debris of all size provides an important insight into the age of alluvium and the evolution of river terraces. The most common methods used to date wood debris are radiocarbon ( 14 C ) dating and dendrochronology. Wood debris in alluvium of the Carpathian rivers occurs mainly in depositional covers of Holocene terraces. These are better preserved in foothill sections of valleys, not so common in the mountain zone. They are most common immediately below the outlets of the valleys from the Carpathians, e.g. in the valleys of the Wis³oka, Wis³ok and San rivers ( Starkel, 1960 and 1996; Klimek, 1974; Kalicki and Kr¹piec, 1991; Kr¹piec, 1992; Kalicki, 1997; Nogaj-Chachaj et al., 1999). Their presence is commonly considered as indication of climate fluctuations and occurrence of floods in the Carpathians or lateral migration of fluvial channels (Œrodoñ, 1952; Alexandrowicz et al., 1981; Starkel, 1996 and 1999; Kalicki and Kr¹piec 1991; Kalicki, 1991). Geological studies in the Bieszczady Wysokie Mountains (Polish East Carpathians) have revealed the presence of abundant wood debris also in the mountane section of the San river (Haczewski et al., 1998 and 2001). This is accumulated only in floodplain sediments of the San river and its tributaries, far upstream from the margin of the Carpathians. They form a continuous horizon in floodplain sediments, on the top of older gravels and at the base of the younger sandy mud (Kukulak, 2000). The accumulation of this wood debris seems to be not exclusively caused by a climatic factor. This paper presents a description of wood debris in Upper San river floodplain alluvium and presents the results of its dating by the 14 C method. An attempt at explaining the causes of rich supply of wood debris to the river channel is also presented. The dated wood was collected from its rich accumulations in the alluvium in the headwater section (about 20 km long) of the San river, between its source at the Uzhok Pass (863 m a.s.l.) and the junction with the Muczny Stream (upstream from the Kiczera Dydiowska).

2 RADIOCARBON DATED WOOD DEBRIS IN FLOODPLAIN DEPOSITS OF CHARACTERISTICS OF THE STUDY AREA This part of the San river watershed has mountane relief near the water divide (long and steep slopes of the Pasmo Po³onin Range) and foothill relief in the valley part (low altitude differences and gentle gradients). Most of the watershed is wooded (ca. 85%), only the highest parts of the Pasmo Po³onin Range and the bottom of the San river valley (especially the DŸwiniacz Depression) are not forested. The dominant species of trees are beech (ca 46% in the Tarnawa forestry area), less abundant are spruce (ca 27%) and fir (ca 20%; Krygowski, 1975). The high percentage of forests in the slope areas retards the surface runoff from the abundant precipitation (ca 1100 mm per year) and reduces flood waves in the streams. The sediment load in the streams is now small during high water Fig. 1. Extent of the lower fluvial terrace along the San river and its tributaries. 130

3 J. Kukulak et al. states, as intense farming has ceased in the Polish part of the San river watershed (ca 80% of the total) half a century ago. The floodplain is the lowermost level of alluvial deposition in a valley, older terraces lie higher and are arranged in steps. The height of the floodplain above the river level gradually increases downstream, from 0.5 m to 2 m, locally even to 3 m. At places it consists of two horizons (1.5-3 m, m). The width of the terrace is greatest (50 m) in the DŸwiniacz Depression, where the vertical gradient of the river is lower than 0.5 % and the channel is meandering. The floodplain extends along the San river from its very source, and penetrates into valleys of bigger tributaries (NiedŸwiedŸ, Sych³owaty, Halicz, Litmirz and Muczny streams). The sedimentary cover of the terrace differs from the older covers in its finer-grained sediments and a large content of wood debris. Fossil wood is only sporadically found in the sediments of the older terraces. The main horizon with wood debris has a constant stratigraphic position in the floodplain sections. It extends in the lower part of the alluvial cover, at the boundary between the lower gravels and the overlying sandy muds. The wood debris lies in layers or lenses of a few centimetres to 0.5 m thick. Meso-scale fragments of wood debris usually form one thick layer; the finer debris lies in two to five thin, laterally extensive layers. The higher, finegrained part of the alluvial cover contains much less and finer wood debris. Only locally it fills erosional channels at different levels in the vertical sections or is dispersed in mineral deposits. 3. MATERIAL AND METHODS Accumulation of plant debris in exposures of floodplain deposits have been studied and documented in years Determined were forms of the accumulations, their state of preservation; the remains have been identified in selected sections of the terrace (Haczewski et al., 1998). Wood from several debris accumulations was collected for radiocarbon dating (Sianki, Beniowa, Bukowiec, Tarnawa Ni na, okieæ and Dydiowa). One or two samples were taken from each of the selected accumulations, all from the lower part of the vertical sequence (boundary between gravel and sandy mud). All datings were done in years ; most of them in the Gliwice (A. Pazdur), a part in the Cracow Radiocarbon Laboratories (T. Kuc). 14 C concentration in the samples was measured in the Gliwice Radiocarbon Laboratory by gas proportional counting and in the Cracow Radiocarbon Laboratory by liquid scintillation counting. δ 13 C was determined in mass spectrometer, thus conventional radiocarbon age was normalised to δ 13 C = -25, according to the Stuiver and Polach s procedure (1977). 14 C dates were calibrated by use of the Gliwice calibration Program GdCALIB (Pazdur and Michczyñska, 1989), except for some dates of radiocarbon age less than 300 BP, which were calibrated by OxCAL (Ramsey, 1995). In both cases the calibration curve of Stuiver et al. (1998) was used. Table 1 shows the results of radiocarbon dating as conventional radiocarbon ages ( 14 C Age, BP) and after calibration procedure, as the intervals of the highest probability at confidence level 68% (Cal. Age, AD/BC). Geological, archaeological and historical data have been compiled for the period indicated by the radiocarbon dates, including results of palaeobotanical analyses of local peat-bogs (Pa³czyñski, 1962; Marek and Pa³czyñski 1962; Zarzycki, 1963; Ralska-Jasiewiczowa, 1969, 1980 and 1989). These mainly record changes in a vegetation cover of the Bieszczady Mountains during the Holocene, thus indirectly they reflect the phase of a climatic change and early human activity. Archaeological findings are few in the studied area and they suggest rather migrations than settlement in pre-historic times (Reyman, 1958; Parczewski, 1991). Historical data on the San river valley have been collected from archival maps, cadasters, chronicles and published studies (Kummerer, 1855; Akta, 1868; Stadnicki, 1848; Fastnacht, 1962). History of forests and their management during the last five centuries are well documented in the above sources. 4. RESULTS Meso-scale components of fossil wood in the floodplain sediments are logs and their fragments, branches, roots and sporadic polypores. The accumulation of fine debris consist mainly of leaves, bark, fruits and seeds. Noteworthy is the large proportion of bark, branches and tree tops. The wood debris is accompanied by fragments of peat, herbaceous plants and their fruits and seeds, fungal sclerotia and insect remains. Microscope studies of the fine alluvium reveal a significant admixture of microscopic plant detritus in all size fractions. Coarse logs are usually found in shallow erosional troughs dissecting gravels (Beniowa) or in channel sediments at palaeochannel bends (Tarnawa Ni na). They are buried in sand and fine gravel, some logs are completely buried in gravel (Bukowiec and Tarnawa Ni na). The finer wood debris occurs only in the sandy mud, in sections of flat ancient river bottom. Most logs are well preserved. They lack large fragments of bark, but all have cambium preserved. Stumps complete with roots and branches are rare. Locally rotten logs with still visible internal structure also occur. A few logs at Beniowa and Bukowiec bear traces of working with tools (wedge-shaped axe-made incisions and sawmade cuts). A wooden board, symmetrically cut on both sides and perforated, apparently a household object, is exposed at the bottom of the mud layer at Sianki. Many finer wood fragments at Sianki and Tarnawa Ni na are partly impregnated or coated with iron oxides, which makes them more resistant to decay. Some of the wood fragments are charred or scorched (Kukulak, 2000). Each of the wood debris accumulations is a separate assemblage of size classes, usually composed of several similar classes. The accumulations of coarse wood debris usually lack finer detritus or have only a small proportion of it. The areally more extensive wood debris accumulations display a lateral trend in grain size, depending on the form of accumulation. Besides size sorting (layers of leaves or branches), weight sorting also occurs (e.g. fruits, 131

4 RADIOCARBON DATED WOOD DEBRIS IN FLOODPLAIN DEPOSITS OF... bark). These features are better visible in the accumulations of plant detritus in low-gradient segments of the valleys (Beniowa and okieæ). Wood in each of the eight radiocarbon-dated samples, has a different conventional radiocarbon age (Table 1). The obtained dates cover a wide time interval: from 3270±70 BP (Tarnawa Ni na I) to modern ±1.1 pmc (Sianki). Half of the dated samples represent wood that died at modern times (18 th -19 th centuries). The dates of wood from Beniowa (122±60 BP), wattle made from thin stems and twigs at okieæ (150 ±60 BP) and a layer of beech leaves at Dydiowa (140±60 BP) fall within a very narrow time interval. The other half of the samples consisted of much older wood, and the differences in their ages attain years. Only at Tarnawa Ni na, wood from a thick log (I) and fir cones (II) buried in the same horizon, have similar ages (terminal part of the Subboreal Epoch of the Holocene). Dating of the studied wood debris indicate that wood debris of various age has been buried in the floodplain alluvium. Very young is the debris that fills an erosional channel at Sianki, older are artificial wattle reinforcements at okieæ. The logs buried in the basal gravels at Bukowiec are from the beginning of the Common Era, and those at Tarnawa Ni na are as old as Subboreal. The presence and predominance in the alluvium of wood debris dated at the last three centuries, proves that most of the debris was accumulated at times close to, or only slightly later than, its radiocarbon dates. It could occur in the 18 th or 19 th century. The dates of these samples do not determine the age of the main wood debris horizon over the whole length of the San valley. Also the presence of the oldest wood in this horizon (Tarnawa Ni na) may be the result of its redeposition from older terraces. 5. DISCUSSION AND CONCLUSIONS The times of plant death indicated by the radiocarbon dates of wood are related to events of both climatic (the older dates) and anthropogenic (the younger dates) nature in the natural environment of the Bieszczady Mountains. The age of the buried logs at Tarnawa Ni na corresponds to the phase of frequent floods in the watershed of the upper Vistula River towards the end of the Subboreal time (Starkel, 1977 and 1994). Also the age of the logs at Bukowiec is isochronous with floods in the Carpathian rivers in Roman times, and the fragments from Beniowa with floods in early Mediaeval times (Fig. 2). The flood sediments of the upper Vistula river laid down at those periods include numerous buried logs (Awsiuk et al., 1980; Kalicki and Kr¹piec, 1991 and 1996; Kr¹piec, 1992). The older dates from the studied wood debris fit well within the phases of the San river floods and may be related to climatic conditions. The number of older dates is, however, too small to exclude that the coincidence is only accidental. The accumulations of the younger wood debris have been also laid down during floods, but the cause of their deposition seems to be mainly anthropogenic. It is related to the phase of settlement and onset of farming in the part of the Bieszczady Mountains during late Mediaeval and early Modern times. Many permanent settlements of farmers and wood workers have been founded here on inhabited grounds during the second half of the 16 th and at the beginning of 17 th century. These have evolved later into agricultural villages (Fastnacht, 1962). The settlements were located in areas that were already partly deforested as pasture grounds at valley bottoms (Ternowe Table 1. Description (name, depth, material) and conventional and calibrated ages of the samples. Calibrated age range has been determined with confidence level 68% using the GdCALIB programme, developed in the Gliwice Radiocarbon Laboratory and Oxford programme OxCal for very young samples. Sample name/depth Lab. No. 14 C Age [BP] Range of Cal. Age Dating material [AD/BC] Sianki/ m Twigs, cones Gd ±1.1pMC (*) MODERN Beniowa I/0.7 m Charcoal KR ±60 [1800, 1950] AD Beniowa II/ m Leafs, twigs, bark Gd ±50 [636, 686] AD Bukowiec/ m Wood Gd ±50 [21, 91] AD Tarnawa Ni na I/ m Wood Gd ±70 [1621, 1491] BC Tarnawa Ni na II/ m Twigs, cones Gd ±70 [1002, 762] BC okieæ/2.5 m Wood KR ±60 [1720, 1820] AD Dydiowa/0.7 m Leaves, twigs KR ±60 [1800, 1890] AD Cal. Age = calibrated age, Lab. No.= laboratory number, Gd- = Lab. No. of 14 C dates from Gliwice Radiocarbon Laboratory, KR- = Lab. No. of 14 C dates from Laboratory of the University of Mining and Metallurgy, Cracow, (*) = pmc-percent of modern carbon. 132

5 J. Kukulak et al. Fig. 2. Corelation of phases of settlement in the Bieszczady Mountains with the age of wood debris in the lowest (1-3 m) terrace. A period of permanent settlement and farming in the Bieszczady Mountains; B record of human influence on environment in pollen diagrams of peat-bogs (after Ralska-Jasiewiczowa, 1989); C radiocarbon dates; D dated wood fragments at the bottom of the fine-grained; E dated wood fragments from the fillings of erosional thoughs in the alluvial terrace. Archaeologic periods: I Hallstatt, II - La Tène, III Roman, IV Migration, V Medieval, VI Modern times. Underlined are dates from San tributary situated off the west margin of Fig. 1. Pole, Beniowe Pole and Pole Bukowiec). The glades were mainly the work of the Valachian herders who were coming here seasonally from the 14 th to 16 th century, with their herds of cattle and sheep (Kubijowicz, 1926; Parczewski, 1991). The first villages were located in the DŸwiniacz Depression: DŸwiniacz Górny (before 1529), Tarnawa Ni na and Tarnawa Wy na (1537). The expansion of settlements reached the Uzhok Pass in the end of the 16 th century: Bukowiec (1580), Beniowa (1580) and Sianki (1580). The economy of these villages was based on cattle herding and grain growing, activities that required wide expansion of farmland. Clear cutting of forests began on great scale, providing areas for arable fields and meadows. The clearcuts were not limited to the areas around villages but also included widening of natural mountain meadows on the mountain crests (so called poloninas). Tax registers from the 16 th and 17 th centuries (Spisy, 1787), land cadasters from the 18 th. (Akta, 1868) and old maps from the 18 th -19 th centuries (Liesganig, 1824; Kummerer, 1855) prove a nearly complete deforestation of the valley bottom, a large reduction in the forest area on slopes and lowered timberline around the poloninas. The clearing of forest was done mainly by fire clearance. Initially, this was the easiest way to gain farmland, then also to fertilise it (Kubijowicz, 1926; Broda, 1952; Pa³czyñski, 1962). The settlers usually did not perform complete clearcutting and did not clear the area of branches, tree tops and bark. This wood debris was burnt in place or thrown away to stream channels (Szwab, 1956). The rapid re-growing of woods in non-cultivated ground and repeated cutting in the same places favoured accumulation of large amounts of wood debris in nearby stream channels. The initial phase of settlement in the San river valley had to be the most productive in wood litter. The increased runoff due to deforestation of slopes resulted in more violent flooding of the streams and enabled transport of the wood debris to the San river channel. This supply had to be rich, as the debris formed thick accumulations in the channel sediments and erosional troughs on terraces. The deposition of wood debris was accompanied by increased load of slope-derived sediments in flood waters. This increased supply of clay from arable fields resulted in a tendency to alluvial aggradation in the San river channel. The alluvial aggradation was the fastest along reaches with low vertical gradient (below 0.5%). It was also at those places where the greatest amount of wood debris was laid down. The burnt and charred wood found in this debris may be the product of fire clearance. The radiocarbon dates from the burnt wood 133

6 RADIOCARBON DATED WOOD DEBRIS IN FLOODPLAIN DEPOSITS OF... at Beniowa correspond to the period of the greatest activity of local wood-burning industries (potash-making facilities, blacksmithery and steam-powered sawmills). A large part of the buried logs may have come from undercutting of river banks, as conditions for lateral channel migration existed during the greater floods. All the wood debris, dated at various periods of the late Holocene, is now buried in the alluvial cover of the same terrace. The interpretation of time of their deposition in the alluvium is thus not unequivocal. One may assume that the floodplain consists of fragments of different age, so that older wood is buried in the older fragments, and younger wood in the younger ones. The division of the terrace into fragments of different age is, however, expressed in its stratification (gravels at bottom, mud above) rather than in the presence of laterally adjacent segments of different age (due to lateral aggradation). Only a part of the fine-grained alluvium (the upper part of the cover) includes fills of linear erosional troughs. The main horizon of wood debris forms a layer in the terrace and it seems to be isochronous. It is thus more likely that the older wood debris was redeposited to the young alluvium from the older terraces of the San. 6. ACKNOWLEDGEMENTS The paper is based on data obtained during geological mapping in the Bieszczady Mountains. The mapping project was led by Professor Grzegorz Haczewski who provided assistance in the fieldwork, in the discusion of the results and translated the text to English. Professor Micha³ Parczewski of Jagiellonian University has introduced J.Kukulak into the recent results of archaeological research in the Bieszczady. 7. REFERENCES: Akta Grodzkie i Ziemskie z Archiwum tzw. Bernardyñskiego we Lwowie (Town and Land Acts from the so called Bernardine Archive in Lvov) I-XXV. Lwów Alexandrowicz S.W., Klimek K., Kowalkowski A., Mamakowa K., Niedzia³kowska E., Pazdur M. and Starkel L., 1981: The evolution of the Wis³oka valley near Dêbica during the Late Glacial and Holocene. Folia Quaternaria. 53: 91 pp. Awsiuk R., Niedzia³kowska E., Pazdur A., Pazdur M.F., Starkel L. and Walanus A., 1980: Preliminary results of studies on the age of the Holocene alluvia at the left bank of the Wis³oka river near Dêbica. Studia Geomorphologica Carpatho-Balcanica 14: Broda J., 1952: Gospodarka zrêbowo-wypaleniskowa w Beskidzie ywieckim (La cultivation du sol par essartage et brûlage dans les Beskides de ywiec). Slavia Antiqua. 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7 J. Kukulak et al. Ralska-Jasiewiczowa M., 1980: Late Glacial and Holocene of the Bieszczady Mts (polish Eastern Carpathians). PWN, Warsaw Cracow: 199 pp. Ralska-Jasiewiczowa M., 1989: Type region: The Bieszczady Mts. Acta Paleobotanica 29: Ramsey Ch. B., 1995: Radiocarbon calibration and analysis of stratigraphy: The OxCal Program. In: Cook G.T., Harkness D.D., Miller B.F. and Scott E.M. eds. Proceedings of the 15 th International Radiocarbon Conference, June August, 1994, Glasgow, Scotland. Radiocarbon 37 (2): Reyman J., 1958: Uwagi o roli prze³êczy U ockiej w œwietle znalezisk monet rzymskich (Reflections sur le role du col d U ok mis en lumière par les trouvailles de monnaies romaines). Acta Archaeologica Carpathica 1: Spisy katastralne z lat , : Materia³y Centralnego Archiwum Historycznego Ukrainy we Lwowie (Cadasters of , Materials of Central Historical Archive of Ukraine in Lvov), Lwów. Stadnicki A., 1848: O wsiach tzw. wo³oskich na pó³nocnym stoku Karpat (On the so called Valachian villages on the northern slope of the Carpathians). Lwów: 65 pp. Starkel L., 1960: Rozwój rzeÿby Karpat fliszowych w holocenie (The development of the flysh Carpathians relief during the Holocene). Prace Geograficzne IGiPZ PAN. Cracow 142: 98 pp. Starkel L., 1977: Paleogeografia holocenu (The palaeogeography of the Holocene). PWN, Warsaw: 362 pp. Starkel L., 1994: Czêstotliwoœæ powodzi w holocenie w œwietle metod sedymentologicznych, geomorfologicznych i datowañ bezwzglêdnych (dorzecze górnej Wis³y). (Flood frequency during the Holocene reconstructed on basis of sedimentologic, geomorphologic and absolute dating methods (UpperVistula basin)). Geochronometria 10: Starkel L., 1995: Evolution of the Carpathians valleys and the Forecarpathian Basin in the Vistulian and Holocene. Studia Geomorphologica Carpatho-Balcanica 29: Starkel L., 1996: Evolution of the Vistula river during the last years. Geographical Studies, Special Issue 9: pp Starkel L., Gêbica P., Kalicki T., Ludwikowska M. and Niedzia³kowska E., 1999: Chronostratygrafia aluwiów i form fluwialnych w po³udniowej Polsce (Chronostratigraphy of alluvia and fluvial forms in southern Poland). In: Pazdur A., Bluszcz A., Stankowski W. and Starkel L., eds, Geochronologia górnego czwartorzêdu Polski w œwietle datowania radiowêglowego i luminescencyjnego (Geochronology of the Upper Quarternary of Poland in the light of radiocarbon and luminescence dating) WIND-J. Wojewoda, Wroc³aw: Stuiver M. and Polach H.A., 1977: Reporting of 14 C data. Radiocarbon 19: Stuiver M., Reimer P. J. and Braziunas T. F., 1998: High precision radiocarbon age calibration for terrestrial and marine samples. Radiocarbon 40: Szwab A., 1956: W sprawie oczyszczania powierzchni zrêbowych z odpadów i ga³êzi (On clearing clearcut surfaces from debris and branches). Sylwan 12: Œrodoñ A., 1952: Ostatni glacja³ i postglacja³ w Karpatach (Last Glacial and Postglacial in the Carpathians). Biuletyn PTG, 67: Zarzycki K., 1963: Lasy Bieszczadów Zachodnich (The Forests of the Western Bieszczady Mts., Polish Eastern Carpathians). Acta Agraria Silvestria 3:

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